Orange Cloud + SvelteKit = Double rendering?

I setup a barebones SvelteKit site deployed to Cloudflare Pages, and when the orange cloud DNS proxy is turned on, it renders the content twice. Turning off the orange cloud or going directly to the pages URL it renders correctly.

See links:
Orange clouded URL: https://beta.varrieur.dev/
Pages URL (same deployment): https://mvarrieur-sveltekit.pages.dev/